Are you building a bike to look at, or one to ride? Chances are when you are sitting on the bike it will be lower, if not you have something drastically wrong with the fork. 3"? You have effectively taken away 1/2 the fork travel, and there is no chance of riding that and not having it bottom out on something.
I'm surprised with all the talk of stance thee days on bike that no one puts air caps on the forks and carries around a little pump. You could drop it just like a a car on air bags in the parking lot (well to a certain extent anyway)